You're fooling yourself. You didn't teach her anything. Pawing is a nasty habit that experienced horse people try to discourage, not encourage. She already knows how to paw, you're just encouraging her to do it. When it backfires on you and she starts to paw when you don't want her to, just remember that you're the one responsible for her bad behavior.
You just wanted to brag about how clever you are. Well, it's not clever to encourage a vice in a horse who didn't previously have it. It's downright unintelligent.